US20040184422A1 - Method and apparatus for performing a handoff in an inter-extended service set (I-ESS) - Google Patents

Method and apparatus for performing a handoff in an inter-extended service set (I-ESS) Download PDF

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Publication number
US20040184422A1
US20040184422A1 US10/730,603 US73060303A US2004184422A1 US 20040184422 A1 US20040184422 A1 US 20040184422A1 US 73060303 A US73060303 A US 73060303A US 2004184422 A1 US2004184422 A1 US 2004184422A1
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station
terminal
wwan
wlan
handoff
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US10/730,603
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Kamel Shaheen
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InterDigital Technology Corp
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InterDigital Technology Corp
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Priority to US10/730,603 priority Critical patent/US20040184422A1/en
Priority to AU2004221067A priority patent/AU2004221067B2/en
Priority to BRPI0409061-6A priority patent/BRPI0409061A/en
Priority to JP2006507129A priority patent/JP2006521058A/en
Priority to MXPA05009832A priority patent/MXPA05009832A/en
Priority to KR1020057017347A priority patent/KR20050119123A/en
Priority to EP04720429A priority patent/EP1604534A4/en
Priority to PCT/US2004/007639 priority patent/WO2004084463A2/en
Priority to CA002518798A priority patent/CA2518798A1/en
Priority to TW093130442A priority patent/TW200533209A/en
Priority to TW096101470A priority patent/TW200746849A/en
Priority to TW093106892A priority patent/TWI252654B/en
Priority to ARP040100878A priority patent/AR043630A1/en
Assigned to INTERDIGITAL TECHNOLOGY CORPORATION reassignment INTERDIGITAL TECHNOLOGY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHAHEEN, KAMEL M.
Publication of US20040184422A1 publication Critical patent/US20040184422A1/en
Priority to NO20054660A priority patent/NO20054660L/en
Priority to JP2007054911A priority patent/JP2007195222A/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements

Definitions

  • the present application relates to Inter-Extended Service Sets (I-ESSs), and more particularly, to a method and apparatus for performing a handoff between ESSs.
  • I-ESSs Inter-Extended Service Sets
  • a wireless terminal in moving about a wireless local area network (WLAN) or a wireless wide area network (WWAN), comprised of a plurality of extended service sets (ESSs) may, due to its movement, lose contact with an access point (AP) in one ESS and thus desire to establish communication with another ESS.
  • the ESSs may either be in the same network, i.e., either a WLAN network or a WWAN network, or may be in different networks, i.e., one in a WLAN network and the other in a WWAN network. It is thus desirable to provide a simple and yet effective method and apparatus for performing such a handoff, with or without loss of the original connection.
  • the present invention is characterized by utilizing an access router (AR) of the ESS originally communicating with the STA to achieve an effective handoff.
  • AR access router
  • FIGS. 1A and 1B taken together, represent a schematic diagram of a handoff in an inter-extended service set (I-ESS) employing a terminal-based procedure.
  • I-ESS inter-extended service set
  • FIG. 2 shows a schematic diagram representing a handoff in an I-ESS employing a system-based handoff procedure.
  • FIGS. 3A and 3B taken together, show another system-based handoff procedure within I-ESSs.
  • FIGS. 4A and 4B taken together, comprise a schematic diagram representing a handoff in an I-ESS which is terminal-based and wherein the connection of the STA with ESS- 1 is not lost.
  • FIGS. 1A and 1B there is shown therein a network of I-ESSs and a wireless STA capable of communication therewith.
  • ESSs extended service sets
  • STAs wireless stations
  • FIGS. 1A and 1B have been limited to a showing of two such extended service sets, ESS- 1 and ESS- 2 , and a single wireless STA, it being understood that the method and apparatus disclosed herein may be employed with equal success in a network having a greater number of ESSs and wireless STAs.
  • the STA associates with the access point (AP- 1 ) of a first extended service set ESS- 1 , further having an access router AR- 1 .
  • the STA receives the identification of ESS- 1 (ESS- 1 ID) along with the basic service set identifier (BSS ID).
  • the STA is then connected to the internet protocol (IP) network and is assigned either an IP address (IPv4) address or alternatively is connected by way of its IP version 6 (IPv6) address.
  • IP internet protocol
  • step S 2 it is assumed that the STA loses its connection with AP- 1 due to change of location of STA, noise, natural or manmade barriers, or for any other reason, whereby the STA, at step S 3 , scans for a new AP, finds AP- 2 which is part of the extended service set ESS- 2 , and locks on to a received beacon frame from ESS- 2 .
  • the STA retrieves information regarding AP- 2 including the basic service set identifier (BSSID- 2 ) and the ID for ESS- 2 (ESS- 2 ID).
  • BSSID- 2 basic service set identifier
  • ESS- 2 ID ID for ESS- 2
  • the STA determines that BSSID- 2 is not the same as BSSID- 1 and thereby starts a re-association process whereupon, at step S 6 , the STA sends a re-association message which includes the AP- 1 ID, the AP- 2 ID and the ESSID.
  • AP- 2 of ESS- 2 at step S 7 , authenticates and authorizes the STA, but the distribution system in ESS- 2 fails to recognize AP- 1 .
  • AP- 2 sends a re-association success message to the STA.
  • the STA acquires access to the IP network and initiates a handoff procedure deploying either mobile IPv4 (MIPv4) or mobile IPv6 (MIPv6) by providing the old IP address, also known as the care of address (CoA), which is typically used by a mobile user when roaming into a foreign IP network.
  • access router- 2 AR- 2
  • access router- 1 AR- 1
  • AR- 1 reroutes the traffic to AR- 2 and releases the states of the STA in AP- 1 and ESS- 1 .
  • step S 12 the handoff procedure is completed and the session traffic is redirected to the STA via AP- 2 whereupon, at step S 13 , the original session is continued.
  • FIGS. 1A-1B shows the manner in which a handoff is made from an ESS- 1 to an ESS- 2 in a WLAN network
  • handoffs of WWAN to WWAN, WLAN to WWAN and WWAN to WLAN may be performed with equal success employing the algorithm of the present invention.
  • the above combinations also apply to the embodiments of FIGS. 2 to 4 B.
  • FIG. 2 shows a system-based handoff wherein only those steps which distinguish from the steps in FIG. 1A/ 1 B are designated with a “prime”.
  • steps S 1 through steps S 6 are substantially identical to steps S 1 through steps S 6 as shown in FIG. 1A.
  • AP- 2 in addition to authenticating and authorizing the STA, queries an essential data base in ESS- 1 to retrieve the IP address (i.e., the CoA) of AR- 1 and, upon receipt of this information, AR- 2 invokes an MIP handoff procedure to transfer the session thereafter sending a re-association success message at S 8 .
  • IP address i.e., the CoA
  • AR- 2 invokes an MIP handoff procedure to transfer the session thereafter sending a re-association success message at S 8 .
  • steps S 9 through S 13 shown in FIG. 1B or steps similar thereto should follow step S 8 of FIG. 2. These steps have been omitted in FIG. 2 for simplicity.
  • FIGS. 3A and 3B show another scenario wherein a modified system-based handoff is provided and the ESS- 2 queries the STA.
  • steps similar to those shown in FIGS. 1A and 1B are shown “unprimed”; steps similar to the “primed” steps in FIG. 2 are shown “primed” and steps different from those shown in FIGS. 1A, 1B and 2 are designated with a “double prime”.
  • steps S 1 through S 6 are substantially identical to steps S 1 through S 6 of FIG. 1, for example.
  • AP- 2 of ESS- 2 authenticates and authorizes the STA and queries the STA to retrieve the IP address (CoA) of AR- 1 and, at step S 8 ′′, queries the STA as to the IP address of AR- 1 .
  • the STA at step S 9 ′′, responds by providing the IP address of AR- 1 .
  • AR- 2 at step S 10 contacts AR- 1 and invokes the MIP ( 4 or 6 ) procedures.
  • Steps S 11 and S 12 follow step S 10 whereupon AP- 2 sends the STA a re-association success message at step S 12 ′, followed by restoration of the session traffic, at S 13 ′′.
  • FIGS. 4A and 4B show a terminal-based handoff scenario in which the original connection is not lost.
  • Steps S 1 through S 9 are substantially the same as steps S 1 -S 9 of FIG. 1A/ 1 B except that step S 2 is omitted. However, although the session established through ESS- 1 has not been interrupted, it is assumed that the STA desires (for whatever reason) to initiate a handoff. At step S 9 , the STA contacts AP- 1 to initiate a handoff.
  • step S 9 AR- 1 , at step S 10 , contacts AR- 2 to invoke the MIP ( 4 or 6 ) procedures.
  • the remaining steps S 11 -S 13 are the same as in FIG. 1A/ 1 B. However, since the STA is still connected to ESS- 1 , AR- 1 , at step S 10 ′, initiates the handoff.
  • step S 2 is omitted when the connection is not lost and step S 10 is modified wherein AR- 1 contacts AR- 2 and invokes the MIP ( 4 or 6 ) procedures.
  • the remaining steps S 11 -S 13 remain unchanged.

Abstract

Method and apparatus for handoff between two stations of a wireless local area network/wireless wide area network (WLAN/WWAN) wherein a terminal, communicating with a first station, scans for a second station when its connection with said first station is lost, or for any other reasons, and establishes communication with a second station. The establishment of communication with the second station includes determining that the second station is different from the first station; associating with the second station; forwarding the identity of the first station to the second station; and using the identity of the first station to continue the original session through the second station. The handoff is equally successful when the stations involved in the handoff are both in the same network or wherein the stations are in different networks.

Description

    CROSS REFERENCE TO RELATED APPLICATION(S)
  • This application claims priority from U.S. provisional application No. 60/455,688 filed Mar. 17, 2003, which is incorporated by reference as if fully set forth.[0001]
    • FIELD OF INVENTION
  • The present application relates to Inter-Extended Service Sets (I-ESSs), and more particularly, to a method and apparatus for performing a handoff between ESSs. [0002]
    • BACKGROUND
  • Scenarios exist wherein a wireless terminal (STA), in moving about a wireless local area network (WLAN) or a wireless wide area network (WWAN), comprised of a plurality of extended service sets (ESSs) may, due to its movement, lose contact with an access point (AP) in one ESS and thus desire to establish communication with another ESS. The ESSs may either be in the same network, i.e., either a WLAN network or a WWAN network, or may be in different networks, i.e., one in a WLAN network and the other in a WWAN network. It is thus desirable to provide a simple and yet effective method and apparatus for performing such a handoff, with or without loss of the original connection. [0003]
    • SUMMARY
  • The present invention is characterized by utilizing an access router (AR) of the ESS originally communicating with the STA to achieve an effective handoff. [0004]
    • BRIEF DESCRIPTION OF THE FIGURES
  • The present invention will be understood from a consideration of the accompanying figures, wherein like elements are designated by like numerals and, wherein: [0005]
  • FIGS. 1A and 1B, taken together, represent a schematic diagram of a handoff in an inter-extended service set (I-ESS) employing a terminal-based procedure. [0006]
  • FIG. 2 shows a schematic diagram representing a handoff in an I-ESS employing a system-based handoff procedure. [0007]
  • FIGS. 3A and 3B, taken together, show another system-based handoff procedure within I-ESSs. [0008]
  • FIGS. 4A and 4B, taken together, comprise a schematic diagram representing a handoff in an I-ESS which is terminal-based and wherein the connection of the STA with ESS-[0009] 1 is not lost.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Making reference to FIGS. 1A and 1B there is shown therein a network of I-ESSs and a wireless STA capable of communication therewith. Although it should be understood that there may be any number of extended service sets (ESSs) and wireless stations (STAs) capable of communicating therewith, for purposes of simplicity, FIGS. 1A and 1B have been limited to a showing of two such extended service sets, ESS-[0010] 1 and ESS-2, and a single wireless STA, it being understood that the method and apparatus disclosed herein may be employed with equal success in a network having a greater number of ESSs and wireless STAs.
  • Initially the STA, at step S[0011] 1, associates with the access point (AP-1) of a first extended service set ESS-1, further having an access router AR-1.
  • At step S[0012] 1, the STA receives the identification of ESS-1 (ESS-1 ID) along with the basic service set identifier (BSS ID). The STA is then connected to the internet protocol (IP) network and is assigned either an IP address (IPv4) address or alternatively is connected by way of its IP version 6 (IPv6) address.
  • At step S[0013] 2, it is assumed that the STA loses its connection with AP-1 due to change of location of STA, noise, natural or manmade barriers, or for any other reason, whereby the STA, at step S3, scans for a new AP, finds AP-2 which is part of the extended service set ESS-2, and locks on to a received beacon frame from ESS-2. At step S4, the STA retrieves information regarding AP-2 including the basic service set identifier (BSSID-2) and the ID for ESS-2 (ESS-2 ID).
  • At step S[0014] 5, the STA determines that BSSID-2 is not the same as BSSID-1 and thereby starts a re-association process whereupon, at step S6, the STA sends a re-association message which includes the AP-1 ID, the AP-2 ID and the ESSID. AP-2 of ESS-2, at step S7, authenticates and authorizes the STA, but the distribution system in ESS-2 fails to recognize AP-1. At step S8, AP-2 sends a re-association success message to the STA. At step S9, the STA acquires access to the IP network and initiates a handoff procedure deploying either mobile IPv4 (MIPv4) or mobile IPv6 (MIPv6) by providing the old IP address, also known as the care of address (CoA), which is typically used by a mobile user when roaming into a foreign IP network. At step S10, access router-2 (AR-2) contacts access router-1 (AR-1), invoking the MIP (4 or 6) procedures and, at S11, AR-1 reroutes the traffic to AR-2 and releases the states of the STA in AP-1 and ESS-1. At step S12, the handoff procedure is completed and the session traffic is redirected to the STA via AP-2 whereupon, at step S13, the original session is continued. Whereas the embodiment of FIGS. 1A-1B shows the manner in which a handoff is made from an ESS-1 to an ESS-2 in a WLAN network, it should be understood that handoffs of WWAN to WWAN, WLAN to WWAN and WWAN to WLAN may be performed with equal success employing the algorithm of the present invention. The above combinations also apply to the embodiments of FIGS. 2 to 4B.
  • FIG. 2 shows a system-based handoff wherein only those steps which distinguish from the steps in FIG. 1A/[0015] 1B are designated with a “prime”. Making reference to FIG. 2, steps S1 through steps S6 are substantially identical to steps S1 through steps S6 as shown in FIG. 1A. At step S7′, AP-2, in addition to authenticating and authorizing the STA, queries an essential data base in ESS-1 to retrieve the IP address (i.e., the CoA) of AR-1 and, upon receipt of this information, AR-2 invokes an MIP handoff procedure to transfer the session thereafter sending a re-association success message at S8. It should be understood steps S9 through S13 shown in FIG. 1B or steps similar thereto should follow step S8 of FIG. 2. These steps have been omitted in FIG. 2 for simplicity.
  • FIGS. 3A and 3B show another scenario wherein a modified system-based handoff is provided and the ESS-[0016] 2 queries the STA.
  • Making reference to FIGS. 3A and 3B, steps similar to those shown in FIGS. 1A and 1B are shown “unprimed”; steps similar to the “primed” steps in FIG. 2 are shown “primed” and steps different from those shown in FIGS. 1A, 1B and [0017] 2 are designated with a “double prime”.
  • Making reference to FIGS. 3A and 3B steps S[0018] 1 through S6 are substantially identical to steps S1 through S6 of FIG. 1, for example. At step S7″, AP-2 of ESS-2 authenticates and authorizes the STA and queries the STA to retrieve the IP address (CoA) of AR-1 and, at step S8″, queries the STA as to the IP address of AR-1. The STA, at step S9″, responds by providing the IP address of AR-1. AR-2, at step S10 contacts AR-1 and invokes the MIP (4 or 6) procedures. Steps S11 and S12 follow step S10 whereupon AP-2 sends the STA a re-association success message at step S12′, followed by restoration of the session traffic, at S13″.
  • FIGS. 4A and 4B show a terminal-based handoff scenario in which the original connection is not lost. [0019]
  • Steps S[0020] 1 through S9 are substantially the same as steps S1-S9 of FIG. 1A/1B except that step S2 is omitted. However, although the session established through ESS-1 has not been interrupted, it is assumed that the STA desires (for whatever reason) to initiate a handoff. At step S9, the STA contacts AP-1 to initiate a handoff.
  • After step S[0021] 9, AR-1, at step S10, contacts AR-2 to invoke the MIP (4 or 6) procedures. The remaining steps S11-S13 are the same as in FIG. 1A/1B. However, since the STA is still connected to ESS-1, AR-1, at step S10′, initiates the handoff.
  • Station-initiated handoffs in scenarios when the session is not lost are performed in a manner similar to that in FIG. 3A/[0022] 3B. More particularly, in FIG. 3A/3B, step S2 is omitted when the connection is not lost and step S10 is modified wherein AR-1 contacts AR-2 and invokes the MIP (4 or 6) procedures. The remaining steps S11-S13 remain unchanged.

Claims (15)

What is claimed is:
1. A method for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN comprising:
said terminal:
responsive to loss of a connection with said first station, scanning for said second station;
retrieving information from said second station;
determining that the second station is different from said first station;
transmitting an association message to said second station, and, upon receipt of an association success message from said second station, initiates a handoff, providing to said second station information regarding said first station;
said second station contacting said first station responsive to the information received from said terminal;
said first station rerouting traffic to said second station and releasing said first station; and
said second station responsive to the handoff procedure initiated by said first station reestablishing the session between said terminal and said second station.
2. A method for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal:
responsive to loss of a connection with said first station, scanning for said second station;
retrieving information regarding said second station;
determining that the second station is different from said first station;
transmitting an association message to said second station including information about the first station;
said second station contacting said first station responsive to the information received from said terminal to obtain an IP address of said lost connection;
said terminal providing the IP address of said lost connection responsive to the request therefor;
said second station contacting said first station to initiate a handoff from the first station to the second station;
said first station rerouting traffic to said second station and releasing said first station; and
said second station, responsive to the handoff procedure initiated by said first station reestablishing the session between said terminal and said second station.
3. A method for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal:
responsive to loss of a connection with said first station, scanning for said second station;
retrieving information regarding said second station;
determining that the second station is different from said first station;
transmitting an association message to said second station, including information about the second station;
said second station contacting said terminal responsive to the information received from said first station to obtain an IP address of the lost connection;
said second station contacting the first station to initiate the handoff;
said first station rerouting traffic to said second station and releasing said first station; and
said second station, responsive to the handoff procedure initiated by said first station reestablishing the session between said terminal and said second station.
4. A method for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal:
while connected to said first station, scanning for a second station;
retrieving information from said second station;
determining that the second station is different from said first station;
transmitting an association message to said second station, and, upon receipt of an association success message from said second station, initiates handoff, providing to said first station information regarding said second station;
said first station contacting said second station responsive to the information received from said terminal;
said first station rerouting traffic to said second station and releasing said first station; and
said second station responsive to the handoff procedure initiated by said first station reestablishing the session between said terminal and said second station.
5. A method for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal:
while connected to said first station scanning for said second station;
retrieving information from said second station;
determining that the second station is different from said first station;
transmitting an association message to said second station including information about the first station;
said second station contacting said terminal to obtain an IP address of said connection;
said terminal providing the second station with IP address of said connection responsive to the request therefor;
said second station contacting said first station to initiate a handoff from the first station to the second station;
said first station rerouting traffic to said second station and releasing said first station; and
said second station responsive to the handoff procedure initiated by said first station reestablishing the session between said terminal and said second station.
6. A method for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal:
while connected to said first station, scanning for said second station;
retrieving information from said second station;
determining that the second station is different from said first station;
transmitting an association message to said second station, including information about the first station;
said second station contacting said terminal to obtain an IP address of said connection;
said second station contacting the first station to initiate the handoff;
said first station rerouting traffic to said second station and releasing said first station; and
said second station having means responsive to the handoff procedure initiated by said first station for reestablishing the session between said terminal and said second station.
7. Apparatus for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of two WLAN and WWAN, comprising:
said terminal comprising:
means responsive to loss of a connection with a first one of said stations, scanning for said second station;
means for retrieving information from said second station;
means for determining that the second station is different from said first station;
means for transmitting an association message to said second station, and, upon receipt of an association success message from said second station, initiating a handoff and providing to said second station information regarding said first station;
said second station comprising:
means for requesting said first station to initiate a handoff responsive to the information received from said terminal;
said first station comprising:
means for rerouting traffic to said second station and releasing said first station; and
said second station having means responsive to the handoff procedure initiated by said first station for reestablishing the session between said terminal and said second station.
8. The apparatus of claim 7 wherein said first and second stations are each comprised of an extended service set (ESS) having an access point and an access router.
9. The apparatus of claim 8 wherein the ESS of said first station includes means for providing said terminal with an ESS identification (ESS ID) and a basic service set identifier (BSS ID).
10. The apparatus of claim 9 wherein the means for retrieving information from said second station retrieves an ESS ID and BSS ID of said second station for use by said means for determining.
11. The apparatus of claim 9 wherein said terminal further comprises means for connecting to an internet protocol (IP) network wherein said terminal is assigned an IP address.
12. The apparatus of claim 9 wherein said terminal further comprises means for connecting to an internet protocol (IP) network wherein said terminal is connected through an IP address of said terminal.
13. The apparatus of claim 7 wherein said scanning means includes means to lock on to a beacon from said second station.
14. Apparatus for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal comprising:
means responsive to loss of a session obtained by connection with said first station, to scan for said second station;
means for retrieving information from said second station;
means for determining that the second station is different from said first station;
means for sending an association message to said second station including information about the first station;
said second station comprising:
means for contacting said first station responsive to the information received from said terminal to obtain an IP address of said lost connection;
said terminal having means for providing the IP address of said lost connection responsive to the request therefor;
said second station having means for requesting said first station to initiate a handoff from the first station to the second station;
said first station having means for rerouting traffic to said second station and releasing said first station; and
said second station having means responsive to the handoff procedure initiated by said first station for reestablishing the session between said terminal and said second station.
15. Apparatus for handoff of a wireless terminal between first and second stations in one of a wireless local area network (WLAN) and a wireless wide area network (WWAN), wherein the stations may both be part of a WLAN or a WWAN or one station is part of one of a WLAN or a WWAN and the other station is part of a remaining one of the WLAN and WWAN, comprising:
said terminal comprising:
means responsive to loss of a connection with a first one of said stations, to scan for a second station;
means for retrieving information regarding said second station;
means for determining that the second station is different from said first station;
means for sending an association message to said second station, including information about the second station;
said second station having:
means for contacting said terminal responsive to the information received from said first station to obtain an IP address of the lost connection; and
means for requesting the first station to initiate the handoff;
said first station having means for rerouting traffic to said second station and releasing said first station; and
said second station having means responsive to the handoff procedure initiated by said first station for reestablishing the session between said terminal and said second station.
US10/730,603 2003-03-17 2003-12-08 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS) Abandoned US20040184422A1 (en)

Priority Applications (15)

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US10/730,603 US20040184422A1 (en) 2003-03-17 2003-12-08 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS)
PCT/US2004/007639 WO2004084463A2 (en) 2003-03-17 2004-03-12 Method and apparatus for performing a handoff in an inter-extended service set (i-ess)
BRPI0409061-6A BRPI0409061A (en) 2003-03-17 2004-03-12 method and apparatus for delivering to an interstate service set (i-ess)
JP2006507129A JP2006521058A (en) 2003-03-17 2004-03-12 Method and apparatus for performing handoff in inter extended service set (I-ESS)
MXPA05009832A MXPA05009832A (en) 2003-03-17 2004-03-12 Method and apparatus for performing a handoff in an inter-extended service set (i-ess).
KR1020057017347A KR20050119123A (en) 2003-03-17 2004-03-12 Method and apparatus for performing a handoff in an inter-extended service set(i-ess)
EP04720429A EP1604534A4 (en) 2003-03-17 2004-03-12 Method and apparatus for performing a handoff in an inter-extended service set (i-ess)
AU2004221067A AU2004221067B2 (en) 2003-03-17 2004-03-12 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS)
CA002518798A CA2518798A1 (en) 2003-03-17 2004-03-12 Method and apparatus for performing a handoff in an inter-extended service set (i-ess)
TW096101470A TW200746849A (en) 2003-03-17 2004-03-15 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS)
TW093130442A TW200533209A (en) 2003-03-17 2004-03-15 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS)
TW093106892A TWI252654B (en) 2003-03-17 2004-03-15 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS)
ARP040100878A AR043630A1 (en) 2003-03-17 2004-03-17 A METHOD AND AN APPLIANCE TO PERFORM A NON-INTERFERENCE BETWEEN ESS (EXTENDED SERVICE SET)
NO20054660A NO20054660L (en) 2003-03-17 2005-10-11 Method and apparatus for performing a handoff in a joint extended service set
JP2007054911A JP2007195222A (en) 2003-03-17 2007-03-05 Method for performing handoff in radio terminal, and handoff enabled radio terminal

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US45568803P 2003-03-17 2003-03-17
US10/730,603 US20040184422A1 (en) 2003-03-17 2003-12-08 Method and apparatus for performing a handoff in an inter-extended service set (I-ESS)

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AU (1) AU2004221067B2 (en)
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CA (1) CA2518798A1 (en)
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040186878A1 (en) * 2003-02-21 2004-09-23 Shu Yamamoto Internet service provider facilitating IPv6 connectivity across a customer's network containing IPv4 components
US20050008032A1 (en) * 2003-05-29 2005-01-13 Shu Yamamoto Enabling mobile IPv6 communication over a network containing IPv4 components using ISATAP
US20050015497A1 (en) * 2003-05-29 2005-01-20 Hidetoshi Yokota Automatic IPv6 connect agent discovery using DNS
US20050099976A1 (en) * 2003-09-23 2005-05-12 Shu Yamamoto Enabling mobile IPv6 communication over a network containing IPv4 components using a tunnel broker model
US20060062183A1 (en) * 2004-03-03 2006-03-23 Forte Andrea G Methods and systems for reducing MAC layer handoff latency in wireless networks
US20060067526A1 (en) * 2004-09-15 2006-03-30 Stefano Faccin Apparatus, and an associated method, for facilitating fast transition in a network system
US20060079241A1 (en) * 2004-09-15 2006-04-13 Stefano Faccin Apparatus, and an associated method, for facilitating communication transition in a radio communication system
US20060270447A1 (en) * 2005-05-26 2006-11-30 Sprint Spectrum L.P. Method and system using a conference bridge for handoff of a multi-mode mobile station
US20070153732A1 (en) * 2005-10-21 2007-07-05 Zhonghui Yao Method for a wireless local area network terminal to access a network, a system and a terminal
WO2009065447A1 (en) 2007-11-23 2009-05-28 Telefonaktiebolaget Lm Ericsson (Publ) Wireless lan mobility
US20090323644A1 (en) * 2006-02-17 2009-12-31 Canon Kabushiki Kaisha Communication apparatus, method and system
EP2192799A1 (en) * 2007-09-19 2010-06-02 Panasonic Corporation Network node and mobile terminal
US20120177008A1 (en) * 2006-12-22 2012-07-12 Research In Motion Limited Global Virtual Local Area Network For Voice Communication Sessions In A Wireless Local Area Network
US9144103B2 (en) 2013-04-30 2015-09-22 Motorola Solutions, Inc. Wireless local communication systems and methods from WAN fallback

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7978667B2 (en) 2006-11-30 2011-07-12 Kyocera Corporation Management of WLAN and WWAN communication services to a multi-mode wireless communication device
US7969930B2 (en) 2006-11-30 2011-06-28 Kyocera Corporation Apparatus, system and method for managing wireless local area network service based on a location of a multi-mode portable communication device
US9532399B2 (en) 2006-11-30 2016-12-27 Kyocera Corporation Apparatus, system and method for managing wireless local area network service to a multi-mode portable communication device
US8102825B2 (en) 2006-11-30 2012-01-24 Kyocera Corporation Detection of a multi-mode portable communication device at a mesh network
US8103285B2 (en) 2007-04-19 2012-01-24 Kyocera Corporation Apparatus, system and method for determining a geographical location of a portable communication device
US7826340B2 (en) 2007-08-24 2010-11-02 Kyocera Corporation Hierarchical modulation reverse link interface node providing multiple service levels
US8233433B2 (en) 2008-02-26 2012-07-31 Kyocera Corporation Apparatus, system and method for initiating WLAN service using beacon signals
US8165577B2 (en) 2009-03-19 2012-04-24 Kyocera Corporation Pilot signal transmission management

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907542A (en) * 1996-04-15 1999-05-25 Ascom Tech Ag Dynamic assignment of signalling virtual channels for wireless ATM systems
US6023461A (en) * 1997-10-10 2000-02-08 Nec Usa, Inc. Handoff method for an ATM wireless network wherein both the switch and the mobile buffer cells and the mobile controls when the handoff will occur
US6243581B1 (en) * 1998-12-11 2001-06-05 Nortel Networks Limited Method and system for seamless roaming between wireless communication networks with a mobile terminal
US20020141369A1 (en) * 2001-03-29 2002-10-03 Telefonaktiebolaget L M Ericsson Method, system and node for providing enhanced mobility in simple IP telecommunication networks when performing L2TP tunneling
US20020191627A1 (en) * 2001-05-24 2002-12-19 Barani Subbiah Method and apparatus for seamless mobility beween different access technologies
US20030081583A1 (en) * 2001-10-26 2003-05-01 Sharp Laboratories Of America, Inc. System and method for hybrid coordination in a wireless LAN
US6567416B1 (en) * 1997-10-14 2003-05-20 Lucent Technologies Inc. Method for access control in a multiple access system for communications networks
US20030224792A1 (en) * 2000-02-28 2003-12-04 3Com Corporation Method and apparatus for handoff of a connection between network devices
US20040018841A1 (en) * 2002-04-26 2004-01-29 Dirk Trossen Proactive seamless service provisioning in mobile networks through transferring of application context
US20040204114A1 (en) * 2002-11-04 2004-10-14 James Brennan Forced beam switching in wireless communication systems having smart antennas
US20050117524A1 (en) * 2002-11-08 2005-06-02 Samsung Electronics Co., Ltd. Method for performing handoff in wireless network priority
US6947483B2 (en) * 2000-08-18 2005-09-20 Nortel Networks Limited Method, apparatus, and system for managing data compression in a wireless network
US7006481B2 (en) * 2002-10-10 2006-02-28 Interdigital Technology Corporation System and method for integrating WLAN and 3G
US7350077B2 (en) * 2002-11-26 2008-03-25 Cisco Technology, Inc. 802.11 using a compressed reassociation exchange to facilitate fast handoff

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6473413B1 (en) * 1999-06-22 2002-10-29 Institute For Information Industry Method for inter-IP-domain roaming across wireless networks

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907542A (en) * 1996-04-15 1999-05-25 Ascom Tech Ag Dynamic assignment of signalling virtual channels for wireless ATM systems
US6023461A (en) * 1997-10-10 2000-02-08 Nec Usa, Inc. Handoff method for an ATM wireless network wherein both the switch and the mobile buffer cells and the mobile controls when the handoff will occur
US6567416B1 (en) * 1997-10-14 2003-05-20 Lucent Technologies Inc. Method for access control in a multiple access system for communications networks
US6243581B1 (en) * 1998-12-11 2001-06-05 Nortel Networks Limited Method and system for seamless roaming between wireless communication networks with a mobile terminal
US20030224792A1 (en) * 2000-02-28 2003-12-04 3Com Corporation Method and apparatus for handoff of a connection between network devices
US6947483B2 (en) * 2000-08-18 2005-09-20 Nortel Networks Limited Method, apparatus, and system for managing data compression in a wireless network
US20020141369A1 (en) * 2001-03-29 2002-10-03 Telefonaktiebolaget L M Ericsson Method, system and node for providing enhanced mobility in simple IP telecommunication networks when performing L2TP tunneling
US20020191627A1 (en) * 2001-05-24 2002-12-19 Barani Subbiah Method and apparatus for seamless mobility beween different access technologies
US20030081583A1 (en) * 2001-10-26 2003-05-01 Sharp Laboratories Of America, Inc. System and method for hybrid coordination in a wireless LAN
US20040018841A1 (en) * 2002-04-26 2004-01-29 Dirk Trossen Proactive seamless service provisioning in mobile networks through transferring of application context
US7006481B2 (en) * 2002-10-10 2006-02-28 Interdigital Technology Corporation System and method for integrating WLAN and 3G
US20040204114A1 (en) * 2002-11-04 2004-10-14 James Brennan Forced beam switching in wireless communication systems having smart antennas
US20050117524A1 (en) * 2002-11-08 2005-06-02 Samsung Electronics Co., Ltd. Method for performing handoff in wireless network priority
US20050143073A1 (en) * 2002-11-08 2005-06-30 Samsung Electronics Co., Ltd. Method for performing handoff in wireless network
US7350077B2 (en) * 2002-11-26 2008-03-25 Cisco Technology, Inc. 802.11 using a compressed reassociation exchange to facilitate fast handoff

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040186878A1 (en) * 2003-02-21 2004-09-23 Shu Yamamoto Internet service provider facilitating IPv6 connectivity across a customer's network containing IPv4 components
US20050008032A1 (en) * 2003-05-29 2005-01-13 Shu Yamamoto Enabling mobile IPv6 communication over a network containing IPv4 components using ISATAP
US20050015497A1 (en) * 2003-05-29 2005-01-20 Hidetoshi Yokota Automatic IPv6 connect agent discovery using DNS
US7746891B2 (en) * 2003-05-29 2010-06-29 Kddi Corporation Enabling mobile IPv6 communication over a network containing IPv4 components using ISATAP
US20050099976A1 (en) * 2003-09-23 2005-05-12 Shu Yamamoto Enabling mobile IPv6 communication over a network containing IPv4 components using a tunnel broker model
US7636336B2 (en) 2004-03-03 2009-12-22 The Trustees Of Columbia University In The City Of New York Methods and systems for reducing MAC layer handoff latency in wireless networks
US20060062183A1 (en) * 2004-03-03 2006-03-23 Forte Andrea G Methods and systems for reducing MAC layer handoff latency in wireless networks
US8737351B2 (en) 2004-03-03 2014-05-27 The Trustees Of Columbia University In The City Of New York Methods and systems for reducing MAC layer handoff latency in wireless networks
US20100135252A1 (en) * 2004-03-03 2010-06-03 The Trustees Of Columbia University In The City Of New York Methods and systems for reducing mac layer handoff latency in wireless networks
US20060067526A1 (en) * 2004-09-15 2006-03-30 Stefano Faccin Apparatus, and an associated method, for facilitating fast transition in a network system
US20060079241A1 (en) * 2004-09-15 2006-04-13 Stefano Faccin Apparatus, and an associated method, for facilitating communication transition in a radio communication system
US8081759B2 (en) * 2004-09-15 2011-12-20 Nokia Corporation Apparatus, and an associated method, for facilitating fast transition in a network system
US8116774B2 (en) * 2004-09-15 2012-02-14 Nokia Corporation Apparatus, and an associated method, for facilitating communication transition in a radio communication system
US7466991B2 (en) * 2005-05-26 2008-12-16 Sprint Spectrum L.P. Method and system using a conference bridge for handoff of a multi-mode mobile station
US20060270447A1 (en) * 2005-05-26 2006-11-30 Sprint Spectrum L.P. Method and system using a conference bridge for handoff of a multi-mode mobile station
US20070153732A1 (en) * 2005-10-21 2007-07-05 Zhonghui Yao Method for a wireless local area network terminal to access a network, a system and a terminal
US10645630B2 (en) 2006-02-17 2020-05-05 Canon Kabushiki Kaisha Communication apparatus, method and system
US20090323644A1 (en) * 2006-02-17 2009-12-31 Canon Kabushiki Kaisha Communication apparatus, method and system
US9924440B2 (en) * 2006-02-17 2018-03-20 Canon Kabushiki Kaisha Communication apparatus, method and system
US8953577B2 (en) 2006-02-17 2015-02-10 Canon Kabushiki Kaisha Communication apparatus, method and system
US20140269661A1 (en) * 2006-02-17 2014-09-18 Canon Kabushiki Kaisha Communication apparatus, method and system
RU2510141C2 (en) * 2006-02-17 2014-03-20 Кэнон Кабусики Кайся Communication device, method and system
US8619715B2 (en) * 2006-12-22 2013-12-31 Blackberry Limited Global virtual local area network for voice communication sessions in a wireless local area network
US20120177008A1 (en) * 2006-12-22 2012-07-12 Research In Motion Limited Global Virtual Local Area Network For Voice Communication Sessions In A Wireless Local Area Network
EP2192799A4 (en) * 2007-09-19 2012-02-01 Panasonic Corp Network node and mobile terminal
CN101836469A (en) * 2007-09-19 2010-09-15 松下电器产业株式会社 Network node and mobile terminal
US20100208706A1 (en) * 2007-09-19 2010-08-19 Jun Hirano Network node and mobile terminal
EP2192799A1 (en) * 2007-09-19 2010-06-02 Panasonic Corporation Network node and mobile terminal
US8442006B2 (en) * 2007-11-23 2013-05-14 Telefonaktiebolaget Lm Ericsson Wireless LAN mobility
US20100284368A1 (en) * 2007-11-23 2010-11-11 Telefonaktiebolaget Lm Ericsson (Publ) Wireless LAN Mobility
WO2009065447A1 (en) 2007-11-23 2009-05-28 Telefonaktiebolaget Lm Ericsson (Publ) Wireless lan mobility
US9144103B2 (en) 2013-04-30 2015-09-22 Motorola Solutions, Inc. Wireless local communication systems and methods from WAN fallback

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KR20050119123A (en) 2005-12-20
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AU2004221067B2 (en) 2008-05-15

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